Furuno FELCOM251, Installation Manual

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2. INSTALLING THE SYSTEM
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2.6 Installing the 19” Rack Communication Unit
2.6.1 Overview
Because the Communication Unit comes in two versions, there are two sections de-
scribing installation of the Communication Unit:
• one section for the Communication Unit (the previous section) and
• one section for the 19” Rack Communication Unit (this section)
2.6.2 Grounding the Communication Unit
Antenna Unit cable
The antenna is connected to the Communication Unit by means of the coax and pigtail
cables (installation materials).
For the FELCOM501 Antenna Unit the coax cable is connected with a TNC connector
at the Communication Unit end and an N connector at the antenna end.
For the FELCOM251 Antenna Unit the coax cable is connected with a TNC connector
at both ends.
For information on antenna grounding, see section 2.3.1.
At the Communication Unit end, it is strongly recommended to ground the antenna ca-
ble (see section 4.4.1).
Use a short cable from the Communication Unit to a grounding point in the rack and
connect the short cable to the antenna cable at this grounding point, making sure the
shield of the connector is properly connected to the rack.
Ground stud
To ensure that the Communication Unit is grounded – also if the cable is disconnected
from the Communication Unit, connect an extra ground wire from the rack to the
ground stud on the Communication Unit. This ground wire should be as short as pos-
sible. The ground stud is located next to the power switch.
Ground stud